Donald Trump became the first sitting president in nearly a half-century at a regular-season NFL game, attending the Washington Commanders' 44-22 loss to the visiting Detroit Lions on Sunday.

There were loud boos from some spectators in the stands when Trump was shown on the videoboard late in the first half — standing in a suite with House Speaker Mike Johnson — and again when the president was introduced by the stadium announcer at halftime.

The jeering continued while Trump read an oath for members of the military to recite as part of an on-field enlistment ceremony during the break in the game.

"I’m a little bit late,” Trump told reporters earlier when he got off Air Force One after landing at Joint Base Andrews, following a flyover of Northwest Stadium during the game. He then got in his armored car for the drive to the arena.

“We’re gonna have a good game. Things are going along very well. The country’s doing well. The Democrats have to open it up,” he said — a reference to the government shutdown.

In the first quarter Sunday, before the president arrived, Lions receiver Amon-Ra St. Brown celebrated a touchdown catch by pointing into the stands and moving his arms a la the “ Trump dance ” that several athletes began doing last year.

“I heard Trump was going to be at the game," St. Brown said afterward. "I don't know how many times the president's going to be at the game, so just decided to have some fun.”

Lions coach Dan Campbell said he was too consumed by the game itself to notice that Trump had arrived, "But that's cool. ... You're talking about the president of the United States. That's a big deal.”

His team's quarterback, Jared Goff, was intrigued with seeing Trump's plane fly so low over the stadium.